\documentclass[a4paper]{book}
\usepackage{amsmath}
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\usepackage{titlesec}
\usepackage{amssymb}
\usepackage{color}
\usepackage{geometry}
\usepackage{titletoc}
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\title{Probability Homework Solution}
\author{Wang Jindong\\
	201418013229092\\
	\Letter \href{mailto:wangjindong@ict.ac.cn}{\textcolor{black}{wangjindong@ict.ac.cn}}
	\date{Jan. 17$^{\text{th}}$ 2016}
	}

\titleformat{\chapter}{\centering\LARGE\bfseries}{Chapter\,\thechapter\,}{1em}{}

\begin{document}
	\maketitle
	\tableofcontents

		\input{h1s}

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\end{document}
